How to make not a static HUD (Overlay)

Hello everyone, I have an issue about not static overlays. The thing is I need to create a helmet HUD (I've already made it - check the screenshot), but with animated health bar (that blue thing at the top of the screen must change it's size when player being damaged) and some other animated things if I realise how to make them, such as hunger. How do I make this? 

Also will be glad if you tell me how to disable HUD while is at Third person view.